### Cylinder r Strength h versus s Cube e Strength h

y=0.788xbetween 150 mm dia. cylinders (y) and 100 mm cubes (x) strength forconcrete of grade 80 MPa or below. • HKUproposed a linear relationshipof y=0.78x for concrete grade 80 MPa or below. • Basedon BS EN 206 Table 7, a linear relationshipof y=0.772x (modified for 100mm cubes) is obtained for concrete of grade 80 MPa or below